Oscillation generator



Jl lly 25, 1933. B. pp 1,919,993

OSCILLATION GENERATOR Filed- June 1928 Inventor Z AugustusB Tripp by H'LS "Attorney.

Patented July 25, 1933 A ELECTRICCOM1?ANY, A coitroiaa'rro r OF NEW YJORK, 1 i

' oscILLA'i'Ioiv enivenn'ron' 7 Application filed June 4,

My invention relates 'to electric oscillation generators which are operated at a frequency determined by a piezo electric element, such as aquartz crystal or the iike, and has for its principal object the provision of an improved arrangementand method of operation whereby the piezo electric element is protected from injury and the output of the generator is materially increased.

In the operation of oscillation generators. providedwith a frequency determining elenent such as a quartz crystal, difficulty has' seen heretofore encountered due to the tendency of the crystal to spark. 'Such ing drawing and its scope willbe'pointed out in the appended claims; a diagram of an 1 The drawing is a wiring oscillation generator wherein my invention has beenem'bodied.

This generator includes inputterminals 1 and 2 and output terminals?) and 4 which a are interconnected through a space discharge device 5 which is provided withsa cathode 6, a grid 7 and an anode 8. Ourrent is supplied from a suitable source to the output circuit of the apparatus through supply terminals 9.

Three parallel circuits are connected in the input circuit-of the device 5. these circuits includes a reactor 10, a re- ,istor 11 and a grid bias battery 12.1 Another of these circuits includes a piezo electric element 13" and'the remaining circuit includes a glow tube 14 or the like which begins to transmit current only when the potential of the crystal; 13 exceeds a predetermined value.

In the operation of the invention, it has been found that the glow tube 14 acts as a One of .piez o electric element.

1928;; Serial no. 282,575.

nueus'rus B rn-I1 2, oii ciiir ro i iniin, iriissaoniisnrrs, iissienon ro en'nnnnn Small rallel with the crystal 13 and does not interfere with the starting and operating characteristics, of the ap paratus. If the amplitude of the crystal voltage reaches the break-down voltageiof r theglow tube, however, the tube begins to carry currentand therapid increase in the oscillation amplitude of the crystal. which oscillations is prevented. While the action of the glow tube in increasing the generator output is not altogether understood, itlias been found as the result of repeated observations that this result is consistently produced. 1 It willof course be understood that any device havingthe same characteristics as the glow tube may be utilized to protect the piezo electric crystal and increase the output of the generator.

The embodiment of the invention illustrated and described herein has been selected for the purpose of clearly setting forth the "'principlesinvolvd. It will be apparent,

however, that the invention is susceptible of being modified to meetthedifferent conditions encountered in its use and I therefore aim to coverby the appended claims all modifications within the true spirit and scope of my invention.

What I'claini as new and desire to secure 1 by Letters Patent of the United States, is:

1. An electric apparatus including an electron discharge device having an output circuit, and an input circuit including a piezo electric element, said output circuit and input'circuit being so arranged that oscillations having the natural frequency of said piezoelectric element are produced in said output circuit, and means for increasing the intensityof said oscillations in the out-.

put circuit, saidmeans comprising a dis,- charge. path connected in shunt with said 2-. The combination, in an oscillation generator, of' an electron dischargedevice having an input circuit including a piezo elec- ,ipe

frequency ofthefpiezo electric element and ,Ineans for increasingihe intensity of said 08011131310118 1n the output c rctup, s ald means I transmit urrent between its electmdes my 3:

comprising a; discharge device adaqpbedl 150.;

when the pctential' thereb'etjveenexeefis a discharge device being bohnec bed YiJQ oppite 3. The combination in' anosci llatioiiegen erator, of an electron:d1sc'harge" deV1ce'hav-- j mg an anode, racathode,;aind a r; 1-,.a 0;

eiec tric elemelit ccnrie cted between the 03thode; and-grid, an oscillatory circuit connectedbetWemrthe anode and j cathode in ren t' hejtweeiif its lecfirmies only when the jpxedeter nined jalne.

TRIPP:

otent iel across said-electrodes 1 exceeds a I .i

'. which 'ocillationsi having theinatural fre- ,quencyfof said piezo electric element are gproduced and a; secondv electron' discharge 6 device gecciinecte cl inf shunt with said piezc electric element, said second electron dis- [predetermined value the electrodes of said: charge device being adapted to transmit curi no 

